JP2011021534A - Pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure operation without manually performing crashing work at a snow melting season in a cold district. <P>SOLUTION: A pump includes: a casing 10 having a pumping pipe 11 extending upward in an almost vertical direction from the vicinity of the bottom of a water tank 1; an impeller 18 arranged in the casing 10; a rotary shaft 19 passing through the casing 10 and connected to the impeller 18; a driving means (water-cooled prime mover 20) coupled to an end of the rotary shaft 19, which lies outside the casing 10, and rotating the rotating shaft 19; a jacket 38 arranged at an outer periphery of the pumping pipe 11 to lie near the water level of the water tank 1 and forming a fluid passage 39 between the jacket and the outer periphery of the pumping pipe 11; and a fluid supply means for melting (water cooling mechanism 25) connected to the jacket 38 and passing fluid of a predetermined temperature through the fluid passage 39. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pump installed in a cold region.

  Rainwater and the like are collected in a water tank of a drainage facility, sucked up by a pump, and discharged to a downstream treatment plant. As this type of pump, there is a horizontal shaft pump (see Patent Document 1) in which a rotation shaft for rotating an impeller is disposed in a substantially horizontal direction, and a vertical shaft pump in which a rotation shaft is disposed in a substantially vertical direction. These pumps are installed so that the pumping pipe at the lower end of the casing extends upward in the substantially vertical direction from the vicinity of the bottom of the water tank.

  In cold regions, there is almost no rainwater flowing into the water tank of the pumping station during the winter season when snow continues, so there is no need to operate the pump. On the other hand, during the transition period from winter to spring, water (melting snow) generated by melting of snow flows into the aquarium of the drainage facility in a relatively short time. Therefore, it is necessary that drainage by a pump is possible during this snow melting period.

  However, at the initial stage of the snow melting period, the water in the water tank accumulated by the water leakage head is frozen over about 500 mm from the water surface even though the water tank is empty. Moreover, the ice is frozen not only outside the pumping pipe but also inside. Therefore, even if the pump is operated, the water in the water tank cannot be drained. Therefore, before the pump is operated, it is necessary for the worker to enter the water tank and crush the ice.

JP 2002-206494 A

  An object of the present invention is to provide a pump that can be reliably operated without manually crushing during a snow melting period in a cold region.

  In order to solve the above problems, a pump according to the present invention includes a casing having a pumping pipe extending upward in a substantially vertical direction from near the bottom of a water tank, an impeller disposed in the casing, and the impeller penetrating the casing. A rotating shaft connected to the outer end of the pumping pipe so as to be located near the water surface of the water tank, and a driving means connected to an end of the rotating shaft located outside the casing and rotating the rotating shaft. And a jacket for forming a fluid passage between the outer periphery of the pumping pipe and a fluid supply means for melting that is connected to the jacket and allows a fluid of a predetermined temperature to pass through the fluid passage. It is configured.

  In the pump of the present invention, a jacket is provided in the pumping pipe so as to be positioned in the vicinity of the water surface of the water tank, and a fluid having a predetermined temperature is supplied to the fluid passage formed therein by the fluid supply means for melting. The ice in and around the pump can be melted. For this reason, the pump can be operated reliably without the worker entering the water tank and crushing the ice during the snow melting period in which snow remains around. Further, by operating only the melting fluid supply means during snow accumulation, freezing in and around the pumping pipe can be prevented.

  In this pump, the drive means is a water-cooled prime mover, the melting fluid supply means is a water-cooling mechanism of the water-cooled prime mover, and a jacket connection pipe connected to the jacket is connected to a cooling water flow pipe constituting the water-cooling mechanism. Are preferably branched and connected. In this way, the melting fluid supply means can be configured simply by branching and connecting the jacket connecting pipe to the existing water cooling mechanism.

Moreover, it is preferable that a jacket switching valve is interposed in a jacket connection pipe that connects the melting fluid supply means and the jacket.
In this case, it is preferable to connect a vacuum pump for discharge so as to be positioned between the melting fluid supply means of the jacket connecting pipe and the jacket switching valve.
In this way, when the pump is stopped, the fluid in the jacket connection pipe can be maintained in a discharged state. As a result, freezing in the jacket connecting pipe can be prevented when water is used as the melting fluid. Therefore, the melting operation can be surely performed at the start of operation.

  The casing includes a discharge elbow that is connected to the upper end of the pumping pipe and is curved so as to change the water flow in a substantially horizontal direction, and the pump that is connected to the discharge elbow and rotatably arranges the impeller. A vacuum pump is provided for sucking and filling the water in the water tank from the pumping pipe to the pump case. That is, it is preferable that a vacuum pump that sucks and fills the water in the water tank from the pumping pipe to the pump case is also used as a means for discharging the melting fluid. If it does in this way, drainage means can be easily constituted with existing facilities only by branching and connecting the suction pipe connected to the vacuum pump and the jacket connection pipe.

  In the pump of the present invention, by supplying a fluid at a predetermined temperature to the fluid passage inside the jacket disposed in the pumping pipe by the fluid supply means for melting, the ice in and around the pumping pipe can be melted. it can. For this reason, the pump can be operated reliably without the worker entering the water tank and crushing the ice during the snow melting period in which snow remains around. Further, by operating only the melting fluid supply means during snow accumulation, freezing in and around the pumping pipe can be prevented.

It is the schematic which shows the structure of the pump of embodiment which concerns on this invention. The jacket arrange | positioned at the pumping pipe is shown, (A) is a cross-sectional view, (B) is a longitudinal cross-sectional view. It is a disassembled perspective view of a pumping pipe and a jacket. It is a graph which shows the operation state of the components in each state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a pump according to an embodiment of the present invention. This pump drains rainwater and the like flowing into a water tank 1 of a drainage pump station from an inflow side pipe line (not shown) to the downstream side. The pump is provided with a jacket 38 so as to be positioned on the water surface of the water tank 1, and the water cooling mechanism 25 of the water-cooled prime mover 20 is branched and connected to the jacket 38 to melt the ice 2 and snow around and inside. It can be installed in a cold area with a lot of snow and a long non-operation period.

  Specifically, the pump according to the present embodiment is a horizontal shaft pump, and includes a casing 10 that extends in an inverted L shape. The casing 10 includes a straight tubular pumping pipe 11 extending vertically upward from the vicinity of the bottom of the water tank 1. The pumping pipe 11 of this embodiment is comprised by dividing into 2 parts (11a, 11b) up and down. A suction bell 12 that constitutes a water suction port in the water tank 1 is connected to the lower end of the pumping pipe 11b. The suction bell 12 is formed in a substantially conical cylinder shape whose diameter gradually increases downward. In addition, a discharge elbow 13 is provided at the upper end of the pumping pipe 11a. The discharging elbow 13 changes the water flow in the horizontal direction from the vertically upward water flow generated by the pumping pipe 11. The discharge elbow 13 has an arcuate shape, and an insertion portion 14 is provided on the outer peripheral surface of the discharge elbow 13 for penetrating the rotary shaft 19 in the horizontal direction. The discharge elbow 13 is provided with a pump case 15 in which an impeller 18 is rotatably disposed. The pump case 15 is formed in a cylindrical shape bulging outward in the radial direction so as to form a substantially elliptical sphere. The pump case 15 is further provided with a discharge pipe 17 for discharging water to a discharge water tank (not shown) on the downstream side via a discharge valve 16. In addition, these are each connected by the flange part described simply.

  An impeller 18 for sucking up water in the water tank 1 is disposed in the pump case 15 of the casing 10. The impeller 18 is connected to the tip of a rotary shaft 19 disposed so as to penetrate the insertion portion 14 of the discharge elbow 13 of the casing 10 in the horizontal direction. The rotary shaft 19 is rotatably supported by a bearing (not shown) in the pump case 15. The rotating shaft 19 is connected to a water-cooled prime mover 20 through a speed reducer 24 and a clutch 22 at an end protruding outward from the casing 10.

  The water-cooled prime mover 20 is a driving means for rotating the rotary shaft 19, and in the present embodiment, a well-known diesel (internal combustion) engine that uses light oil or heavy oil as a fuel is used. The output shaft 21 of the water-cooled prime mover 20 is connected to a clutch 22. The clutch 22 turns on (couples) off (separates) transmission of power from the water-cooled prime mover 20. The clutch 22 has an output side connecting shaft 23 connected to a speed reducer 24. The speed reducer 24 decelerates and outputs the power (rotation) of the water-cooled prime mover 20 transmitted via the clutch 22, and the rotary shaft 19 is connected to the output side thereof.

  The water-cooled prime mover 20 is connected to a water-cooling mechanism 25 for circulating cooling water through an internal cooling passage (not shown). The water cooling mechanism 25 includes a heat exchanger 26 for cooling (dissipating heat) the overheated cooling water by heat exchange with air. The outlet of the heat exchanger 26 is connected to the inlet of the water-cooled prime mover 20 by a cooling water flow pipe 27A, and the inlet of the heat exchanger 26 is connected to the outlet of the water-cooled prime mover 20 by a cooling water flow pipe 27B. . The cooling water is circulated from the outlet of the water-cooled prime mover 20 to the inlet of the heat exchanger 26 and from the outlet of the heat exchanger 26 to the inlet of the water-cooled prime mover 20 by a water pump 28 provided in the cooling water flow pipe 27B. The These cooling water flow pipes 27A and 27B are provided with water cooling mechanism switching valves 29A and 29B for switching between open and closed states so as to be positioned in the vicinity of the entrance and exit of the heat exchanger 26. In addition, it is good also as a structure which circulates natural well water instead of the heat exchanger 26. FIG.

  Since the pump of this embodiment is a horizontal axis pump, a suction mechanism 30 is provided for sucking up the water in the water tank 1 from the pumping pipe 11 to the pump case 15 at the start-up and filling the pump case 15 with water. Yes. The suction mechanism 30 has a suction hole 31 formed in the pump case 15 of the casing 10, and a vacuum pump 32 connected to the suction hole 31 by a suction pipe 33. This vacuum pump 32 is a liquid ring type capable of inflow of water. On the downstream side of the vacuum pump 32, an exhaust suction mechanism switching valve 34 for switching the open / close state is provided, and the downstream side of the suction mechanism switching valve 34 is opened to the atmosphere. A check valve 35 that prevents fluid movement from the vacuum pump 32 toward the pump case 15 is interposed on the upstream side of the vacuum pump 32. Further, on the upstream side of the check valve 35, an electric exhaust valve 36 for switching the open / close state is interposed. Between the exhaust valve 36 and the suction hole 31, a known full water detector 37 for detecting whether or not the inside of the pump case 15 is filled with water is interposed.

  And in this embodiment, the jacket 38 is arrange | positioned in the outer peripheral part of the pumping pipe 11b of the casing 10 so that it may be located in the water surface vicinity of the water tank 1. FIG. This jacket 38 forms a fluid passage 39 between the outer periphery of the pumped-up pipe 11b. Then, the cooling water of the water-cooled prime mover 20 is passed through the fluid passage 39 so that the ice 2 and snow located inside the pumped pipe 11b and outside the jacket 38 can be melted. That is, in the present embodiment, the water cooling mechanism 25 of the water cooled prime mover 20 is configured to be used as a melting fluid supply means that allows a fluid having a predetermined temperature to pass through the fluid passage 39.

  Specifically, the jacket 38 is composed of a pair of semi-cylindrical members 40A and 40B, as shown in FIGS. Each semi-cylindrical member 40A, 40B has an inner diameter larger than the outer diameter of the pumped-up pipe 11b. On the upper and lower ends of these semi-cylindrical members 40A and 40B, a reduced diameter portion 41 is provided so as to have an inner diameter that is substantially the same as the outer diameter of the pumped pipe 11b. In addition, fins 42 that extend along the axial direction and project outward in the radial direction are provided on the outer peripheral portions of the semi-cylindrical members 40A and 40B. As shown in FIG. 2A, the fins 42 project radially at a predetermined interval in the circumferential direction in the assembled state. Among them, one semi-cylindrical member 40A is provided with a non-formation region of the fin 42 in a part thereof, and a pair of connection portions 43A and 43B are provided in this non-formation region so as to be positioned at a predetermined interval in the axial direction. ing. These connection portions 43A and 43B are provided with screw holes (not shown). One of the connecting portions 43A and 43B positioned above and below constitutes an inlet and the other constitutes an outlet, and there is no particular limitation on the flow direction thereof. However, for the purpose of melting the ice 2, it is preferable to use the connecting portion 43B positioned on the lower side as an inlet and the connecting portion 43A positioned on the upper side as shown in FIG. Further, as shown in FIG. 3, screw insertion holes 44 are provided at predetermined intervals along the axial direction in the fins 42a, 42a located on both side edges of the semi-cylindrical members 40A, 40B, and tightened with screws (not shown). Accordingly, the outer peripheral portion of the pumped water pipe 11b is configured to be mounted. In order to ensure airtightness, it is preferable to dispose a seal member between each reduced diameter portion 41 and the pumping pipe 11b. Further, a pair of baffle plates 45, 45 are provided on the inner peripheral portions of the semi-cylindrical members 40A, 40B so as to protrude radially inward. The inner peripheral edge of the baffle plate 45 is set so that a predetermined gap is formed between the inner peripheral edge of the baffle plate 45 and the outer peripheral surface of the water pumping pipe 11b. And in this embodiment, the baffle plate 46 is further provided in the pumping pipe 11b so that it may be located between this pair of baffle plates 45 and 45. As shown in FIG. The outer peripheral edge of the baffle plate 46 has an outer diameter so that a predetermined gap is formed between the inner peripheral surfaces of the semi-cylindrical members 40A and 40B.

  As shown in FIG. 1, jacket connecting pipes 47A and 47B are branched and connected to the cooling water flow pipes 27A and 27B of the water cooling mechanism 25 of the present embodiment in order to constitute the melting fluid supply means. Specifically, a jacket connection pipe 47A is branched and connected to a coolant flow pipe 27A that connects the outlet of the heat exchanger 26 and the inlet of the water-cooled prime mover 20, and this jacket connection pipe 47A constitutes the outlet of the jacket 38. It is connected to the connection part 43A. A jacket connection pipe 47B is branched and connected to a coolant flow pipe 27B connecting the outlet of the water-cooled prime mover 20 and the inlet of the heat exchanger 26, and the jacket connection pipe 47B constitutes an inlet of the jacket 38. It is connected to the. Thereby, the cooling water is circulated by the water pump 28 from the outlet of the water-cooled prime mover 20 to the inlet of the jacket 38 (connecting portion 43B), and from the outlet of the jacket 38 (connecting portion 43A) to the inlet of the water-cooled prime mover 20. It is configured to be possible. The jacket connection pipes 47A and 47B are provided with jacket switching valves 48A and 48B for switching the open / close state so as to be located in the vicinity of the branch connection portions with the cooling water flow pipes 27A and 27B.

  In the present embodiment, the vacuum pump 32 of the suction mechanism 30 is also used as a discharge means for discharging the cooling water in the jacket connection pipes 47A and 47B. Specifically, a discharge pipe 49 that communicates the coolant flow pipe 27A and the suction pipe 33 is provided. One end of the discharge pipe 49 is connected to the cooling water flow pipe 27A so as to be located on the downstream side (water-cooled prime mover 20 side) of the branch connection portion with the jacket connection pipe 47A. The other end of the discharge pipe 49 is connected to the suction pipe 33 so as to be positioned between the check valve 35 and the exhaust valve 36. The discharge pipe 49 is provided with an electric discharge switching valve 50 that switches between open and closed states. In the present embodiment, the suction pipe 33 and the jacket connection pipe 47A are connected via the cooling water flow pipe 27A. However, the suction pipe 33 and the jacket connection pipe 47A may be directly connected. However, in this case, the discharge pipe 49 is connected to the branch connection portion side with respect to the jacket switching valves 48A and 48B, that is, the water cooling mechanism 25 side constituting the melting fluid supply means.

  Next, the operation of the pump configured as described above will be described.

  As shown in FIG. 1, in a cold region, the water surface of the aquarium 1 is frozen by freezing even in early spring, and the interior of the water pump 11 is also frozen. Therefore, when starting the operation of the pump, the melting operation of the ice 2 is first executed.

  As shown in FIG. 4, in the melting operation, the discharge valve 16, the suction mechanism switching valve 34, the exhaust valve 36 and the discharge switching valve 50 are closed, and the jacket switching valves 48A and 48B are opened. Further, the vacuum pump 32 is in the stopped off state. Further, the clutch 22 is turned off, and transmission of power to the rotating shaft 19 is interrupted. In this state, the water-cooled prime mover 20 is operated and the water pump 28 is operated. Further, the water cooling mechanism switching valves 29A and 29B are closed after being opened for a predetermined time until the jacket connecting pipes 47A and 47B and the fluid passage 39 in the jacket 38 are filled with cooling water.

  As a result, in the pump, the water-cooled prime mover 20 is operating, but the impeller 18 does not rotate. Also, the cooling water heated by the cooling of the water-cooled prime mover 20 by the operation of the water pump 28 passes through the cooling water flow pipe 27B, the jacket connection pipe 47B, the fluid passage 39, the jacket connection pipe 47A, and the cooling water flow pipe 27A. Circulated. At this time, in the present embodiment, the baffle plates 45 and 46 are provided in the fluid passage 39, so that the overheated cooling water meanders so as to collide with the pumping pipe 11 and the jacket 38. Therefore, water passage (heat exchange) time can be secured. As a result, the ice 2 in the water pump 11 and the ice 2 around the jacket 38 can be melted by the heat of the cooling water. When the water in the water tank 1 can be drained by this melting operation, the operation is started. This melting operation is not executed when the surface of the water tank 1 is not frozen, and the following operation start is directly executed.

  At the start of operation, the water cooling mechanism switching valves 29A and 29B, the suction mechanism switching valve 34 and the exhaust valve 36 are opened, and the discharge valve 16, the jacket switching valves 48A and 48B and the discharge switching valve 50 are closed. Further, the clutch 22 is turned on so that power can be transmitted to the rotary shaft 19, but the water-cooled prime mover 20 and the water pump 28 stop operating. In this state, the vacuum pump 32 is operated.

  Thereby, since the water-cooled prime mover 20 is not operating, the impeller 18 does not rotate. However, the air in the casing 10 is sucked by the operation of the vacuum pump 32, and the water in the water tank 1 is sucked up from the pumping pipe 11 by the negative pressure. When the full water detector 37 detects that the pump case 15 is filled with water, the suction mechanism switching valve 34 and the exhaust valve 36 are closed, and the operation of the vacuum pump 32 is stopped. Maintain negative pressure. Thereafter, normal drainage operation is started.

  In the drainage operation, the discharge valve 16 and the water cooling mechanism switching valves 29A and 29B are opened, and the suction mechanism switching valve 34, the exhaust valve 36, the jacket switching valves 48A and 48B, and the discharge switching valve 50 are closed. Further, the vacuum pump 32 is stopped. Further, the clutch 22 is turned on so that power can be transmitted to the rotary shaft 19 via the speed reducer 24, the water-cooled prime mover 20 is operated, and the water pump 28 is operated.

  As a result, the impeller 18 is rotated by the power of the water-cooled prime mover 20 in the pump. As a result, the water filled in the pump case 15 is drained downstream via the discharge pipe 17. Moreover, a suction force acts on the pumping pipe 11 by this drainage, and the water in the water tank 1 is continuously sucked and drained. Further, the cooling water is circulated between the water-cooled prime mover 20 and the heat exchanger 26 only by the cooling water flow pipes 27A and 27B, so that the water-cooled prime mover 20 can be efficiently cooled.

  In this way, in the snow melting period, a normal drainage operation is performed through a melting operation and an operation start. Then, when it approaches the snowy winter season, the pump drainage operation is stopped. And in this embodiment, it is set as the structure which uses the cooling water which cools the water-cooled motor | power_engine 20 as the fluid supplied by the fluid supply means for melting, This cooling water mixes a well-known antifreeze, In order to prevent freezing, the cooling water in the jacket connecting pipes 47A and 47B is discharged.

  In the discharge operation when the operation is stopped, the suction mechanism switching valve 34, the jacket switching valves 48A and 48B and the discharge switching valve 50 are opened, and the discharge valve 16, the water cooling mechanism switching valves 29A and 29B and the exhaust valve 36 are closed. To do. Further, the clutch 22 is turned off, the water-cooled prime mover 20 is stopped, and the water pump 28 is also stopped. Then, the vacuum pump 32 is operated.

  Accordingly, the pump sucks the cooling water in the jacket connection pipes 47A and 47B including the cooling water flow pipes 27A and 27B and the fluid passage 39 from the suction pipe 33 through the discharge pipe 49 by the operation of the vacuum pump 32, It is discharged outside. When the discharge of the cooling water in the fluid passage 39 and the jacket connection pipes 47A and 47B is completed, a transition is made to a non-operation period in which the pump is not operated at all.

  During this operation stop, all of the discharge valve 16, the water cooling mechanism switching valves 29A and 29B, the suction mechanism switching valve 34, the exhaust valve 36, the jacket switching valves 48A and 48B, and the discharge switching valve 50 are closed. The clutch 22 is turned off to prevent freezing, and the water-cooled prime mover 20, the water pump 28, and the vacuum pump 32 all stop operating. The next time the pump is operated, the discharged cooling water is replenished.

  Thus, in the pump of the present invention, the jacket 38 is disposed in the pumping pipe 11 so as to be positioned in the vicinity of the water surface of the water tank 1, and the fluid passage 39 formed therein is overheated by the water-cooled prime mover 20. Since the cooling water can be supplied, the ice 2 in the pumping pipe 11 and around the pumping pipe 11 (jacket 38) can be melted. Therefore, it is possible to operate the pump reliably without a worker entering the water tank 1 and crushing ice during the snow melting period when snow remains around.

  Further, in this embodiment, since the water cooling mechanism 25 of the existing water-cooled prime mover 20 is used as the melting fluid supply means, it can be simply implemented by simply connecting the jacket connection pipes 47A and 47B. In addition, during the non-operating period in winter, the cooling water in the fluid passage 39 and the jacket connection pipes 47A and 47B is discharged by the vacuum pump 32, so that freezing inside these can be prevented. Therefore, the melting operation can be surely performed at the start of operation. In addition, since the vacuum pump 32 uses an existing pump that fills the inside of the pump case 15, only the discharge pipe 49 is branched and connected between the suction pipe 33 and the jacket connection pipes 47A and 47B. It is easy to implement. In other words, it can be carried out only by additionally installing the jacket 38, the jacket connection pipes 47A and 47B, and the discharge pipe 49 in the existing pump.

  In addition, the pump of this invention is not limited to the structure of the said embodiment, A various change is possible.

  For example, in the above-described embodiment, the operation of the water pump 28 and the vacuum pump 32 is stopped while the operation is stopped. However, the operation may be continued in the state during the melting operation. In this way, it is possible to always prevent freezing in and around the pumping pipe 11.

  Moreover, in the said embodiment, although the vacuum pump 32 which drains the cooling water in the fluid passage 39 and the jacket connection pipes 47A and 47B was made into the structure which combined the existing thing which fills the water in the casing 10, it is exclusive. May be provided.

  Furthermore, in the said embodiment, although the water-cooling mechanism 25 of the water-cooled motor | power_engine 20 was utilized as the fluid for melting | dissolving the ice 2, it is good also as a structure which supplies natural well water. In this case, it is preferable to supply a heated liquid via a heating means such as a boiler. Further, the melting fluid for the ice 2 is not limited to a liquid, but may be a gas or a gas-liquid mixed fluid. In the case of gas, it is preferable to supply warm air heated by a dedicated heating means or exhaust gas of the prime mover. Further, when supplying gas as the melting fluid, the exhaust means using the vacuum pump 32 and the jacket switching valves 48A and 48B of the jacket connection pipes 47A and 47B are unnecessary.

  In the above-described embodiment, the configuration in which the melting fluid supply means of the present invention is provided is applied to the horizontal shaft pump in which the rotating shaft 19 is arranged to extend in the horizontal direction, but the rotating shaft 19 extends in the vertical direction. The same applies to the vertical shaft pump arranged in (1).

DESCRIPTION OF SYMBOLS 1 ... Water tank 10 ... Casing 11 (11a, 11b) ... Pumping pipe 13 ... Discharge elbow 15 ... Pump case 17 ... Discharge pipe 18 ... Impeller 19 ... Rotating shaft 20 ... Water-cooled motor (drive means)
25 ... Water cooling mechanism (melting fluid supply means)
26 ... Heat exchanger 27A, 27B ... Cooling water flow pipe 28 ... Water pump 29A, 29B ... Water cooling mechanism switching valve 30 ... Suction mechanism 32 ... Vacuum pump 38 ... Jacket 39 ... Fluid passage 43A, 43B ... Connection part 47A, 47B ... Jacket connection pipe 48A, 48B ... jacket switching valve 49 ... discharge pipe 50 ... discharge switching valve

Claims (5)

A casing having a pumping pipe extending upward in a substantially vertical direction from near the bottom of the aquarium,
An impeller disposed in the casing;
A rotating shaft passing through the casing and connected to the impeller;
A driving means connected to an end of the rotating shaft located outside the casing, and for rotating the rotating shaft;
A jacket that is disposed on the outer periphery of the pumping pipe so as to be located near the water surface of the water tank, and that forms a fluid passage between the outer periphery of the pumping pipe,
A melting fluid supply means connected to the jacket and for allowing a fluid at a predetermined temperature to pass through the fluid passage;
A pump comprising:   The drive means is a water-cooled prime mover, the melting fluid supply means is a water-cooling mechanism of the water-cooled prime mover, and a jacket connection pipe connected to the jacket is branchedly connected to a cooling water flow pipe constituting the water-cooling mechanism. The pump according to claim 1.   The pump according to claim 1 or 2, wherein a jacket switching valve is interposed in a jacket connection pipe connecting the melting fluid supply means and the jacket.   The pump according to claim 3, wherein a vacuum pump for discharge is connected so as to be positioned between the melting fluid supply means and the jacket switching valve of the jacket connecting pipe. The casing includes a discharge elbow that is connected to an upper end of the pumping pipe and is curved so as to change a water flow in a substantially horizontal direction, and a pump case that is connected to the discharge elbow and rotatably arranges the impeller. Prepared,
The pump according to claim 4, wherein the vacuum pump is for sucking and filling water in the water tank from the pumping pipe to a pump case.

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